Suppose you have the following code:
(define pairs
'([a b]
[c d])) ; This pair is special
and you want to add a new pair [e f]. You press Enter after the [c d] but you get:
(define pairs
'([a b]
[c d]
)) ; This pair is special
and now you need to move the comment back to its original line.
With this quickscript, instead you just need to press Control-Enter instead of Enter to get:
(define pairs
'([a b]
[c d] ; This pair is special
|))
with the cursor at | ready to type the next pair.